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Reduction of focal-spot size using dichromats in absorbance modulation

Hsin-Yu Tsai, Henry I. Smith, and Rajesh Menon

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Abstract

We experimentally verify the focusing characteristics of dichromats, a new class of circular-symmetric diffractive-optical lenses that generate, in the same focal plane, focal spots for one wavelength and ring-shaped spots with central nodes for another wavelength. Using a dichromat, we illuminate a thin photochromic layer and demonstrated point-spread-function compression of the transmitted focal spot.

© 2008 Optical Society of America

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